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annotate tomsfastmath/src/bin/fp_toradix.c @ 643:a362b62d38b2 dropbear-tfm

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Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a with Makefile.in renamed
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Nov 2011 18:10:20 +0700
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a362b62d38b2 Add tomsfastmath from git rev bfa4582842bc3bab42e4be4aed5703437049502a
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1 /* TomsFastMath, a fast ISO C bignum library.
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2 *
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3 * This project is meant to fill in where LibTomMath
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4 * falls short. That is speed ;-)
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5 *
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6 * This project is public domain and free for all purposes.
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7 *
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8 * Tom St Denis, [email protected]
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9 */
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10 #include <tfm.h>
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12 int fp_toradix(fp_int *a, char *str, int radix)
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13 {
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14 int digs;
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15 fp_int t;
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16 fp_digit d;
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17 char *_s = str;
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19 /* check range of the radix */
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20 if (radix < 2 || radix > 64) {
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21 return FP_VAL;
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22 }
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24 /* quick out if its zero */
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25 if (fp_iszero(a) == 1) {
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26 *str++ = '0';
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27 *str = '\0';
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28 return FP_OKAY;
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29 }
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31 fp_init_copy(&t, a);
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33 /* if it is negative output a - */
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34 if (t.sign == FP_NEG) {
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35 ++_s;
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36 *str++ = '-';
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37 t.sign = FP_ZPOS;
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38 }
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40 digs = 0;
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41 while (fp_iszero (&t) == FP_NO) {
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42 fp_div_d (&t, (fp_digit) radix, &t, &d);
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43 *str++ = fp_s_rmap[d];
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44 ++digs;
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45 }
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47 /* reverse the digits of the string. In this case _s points
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48 * to the first digit [exluding the sign] of the number]
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49 */
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50 fp_reverse ((unsigned char *)_s, digs);
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52 /* append a NULL so the string is properly terminated */
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53 *str = '\0';
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54 return FP_OKAY;
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55 }
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57 /* $Source$ */
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58 /* $Revision$ */
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59 /* $Date$ */